The "iodide pump" refers to the
a. mechanism whereby target cells extract iodine-containing thyroid hormone from the blood
b. active transport mechanism that concentrates iodide ions in the thyroid
c. mechanism whereby T3 and T4 are released from thyroglobulin and pumped into the circulation
d. protein binding process whereby T3 and T4 are pumped throughout the body bound to plasma proteins
e. mechanism whereby ingested iodine is absorbed by the small intestine
B
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The cerebrospinal fluid is found between two layers of the meninges, the ____________________ and ____________________.
Fill in the blank(s) with the appropriate word(s).
How do the testes respond to exposure to excessive body warmth?
A) They move close to the pelvic cavity. B) They move away from the pelvic cavity. C) Excessive warmth has no effect on the testicles because of their location in the scrotum. D) Excessive warmth is actually beneficial in that it speeds up the maturation of sperm.
The primary function of the proximal convoluted tubule is
A) filtration of anything small enough to pass through the filtration membrane. B) absorption of ions, organic molecules, vitamins, and water. C) secretion of acids, ammonia, and drugs. D) actively pumping sodium ions and chloride ions out of the filtrate. E) adjustment of urine volume in response to ADH and aldosterone.
The correspondence between a unit of DNA information and an amino acid is the genetic ________.
Fill in the blank(s) with the appropriate word(s).